Joseph a



(No Model.)

J. A. POWERS.

GOMMUTATOR BRUSH FOR DYNAMO 0R MAGNBTO ELECTRIC MACHINES.

PatentedAug. 18, 1885.

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JOSEPH A. POW'ERS, OF TROY, NEW YORK.

COMMUTATOR-BRUSH FOR DYNAMO OR MAGNETO ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 324,590, dated August 18, 1885.

Application filed March 13, 1885.

To all whom it may concern:

Be it known that I, J OSEPH A. PowERs, of Troy, in the county of Rensselaer and State of New York, have invented an Improvement in Oommutator-Brushes for Dynamo and Magneto Electric Machines, of which the following is a specification.

The object of this invention is to adjust the pressure of the brush upon the commutatorplates and to vary the position and pressure with facility.

In the drawings, Figure 1 is a plan of the commutator-brush. Fig. 2 is a cross-section at the line 90 0c, and Fig. 3 is a side elevation with the clamping-nut removed.

The brush A is made of metal wire or plates, preferably of copper, in layers connected permanently together at the end A by solder, so as to maintain said wires or plates in their proper relation to each other. The other or loose ends of the wire are to be brought into contact wlth the commutatonplates in the dynamo or magneto electric machine.

I make use of a trough-shaped piece of sheet metal, 13, into which the brush, made as aforesaid, is placed, and this, together with the brush, is placed into the holder 0, and there is a cap, D, to this holder pivoted atd to the side pieces of the holder 0, and there is a clampingscrew, E, that passes through a boss in the pivoted cap and acts against a spring-plate, F, that is attached to the inner surface of the cap D, and by preference extends beyond the same to press upon the wires of the brush and act as a guide by which to set the brush in its proper position. This cap D being pivoted will swing and allow the brush to be easily entered beneath it at either end, and it also holds the brush very firmly when clamped by the screw E.

There is a stud or fixed gudgeon, G, extending out from a suitable support and occupying a position parallel, or nearly so, to the axis of the commutator-plates, and there are downwardly-projecting flanges O at the under side of the holder 0, in which are holes that allow the holder to be slipped upon the stud G, and upon this stud the brush-holder and brushes can be swung so as to bring the ends of the brush into contact with the commutator- (No model.)

plates or separate the same. The outer portion of the stud G is turned off smaller to form a shoulder at h, and upon this reduced portion of the stud is a thumb-lever, K, and the end of the stud G is made as a screw with a clamping-nut, L, the head of which should be milled and sufficiently large to clamp the lever K firmly against the shoulder h and hold it in any position to which it may be swung. Upon this lever K are two springs, M N, extending outwardly and upwardly so as to come in contact with the under side of the holder 0.

It will now be understood that the brush of wires or plates can be projected to any desired length,so as to come properly into contact with the commutator-bars, and this adjustment can be made from time to time as the brush wears; and the wires or plates of the brush can be made to press upon the commutator-plates with any desired force,or be lifted or held from contact with such plates, because by loosening the nut L the thumblever K can be swung upon the stud G either one way or the other, and when in operation the spring M will cause the ends of the brush to press with the desired force upon the ccnnnutator-plates5 or, if the lever K is moved in the other direction, the spring N will lift the brush off the commutator-plates and hold the same in its elevated position. A portion of the outline of the commutator is shown at A The length of the stud G between the collar h and the support for said stud is to be greater than the width of the brush-holder C; hence such brush-holder and brush can be moved along upon the stud G, to bring the ends of the brush upon a new portion of the commutator-plates, without altering the pressure of the spring M that presses the brush into c011- tact with the commutator-plates.

I claim as my invention 1. The brush of wires or plates and a holder, 0, a pivoted cap, D, and clamping-screw E, in combination. with a spring-plate, F, between the cap D and brush and extending beyond the cap, substantially as set forth.

2. The stud or gudgeon G, having a shoulder at 71, in combination with the brush A, holder 0, lever K, spring M, and clamping-nut L, substantially as set forth.

3. The brush A, holder 0, eap D, and screw Signed by me this 4th day of March, A. D. E, in combination with the stud G, passing 1885. through holes in the flanges O of the holder 0, the lever K upon the stud G, the springs JOSEPH A. POWERS. 5 M N, extending out from such lever K and acting against the under side of such .holder \Vituesses: G, and the clamping-nut L, substantially as set A. G. GOLDTI-IWAIT, forth. 0. H. TOLI-IURST. 

